Bleach gel pens are great for erasing stains on white shirts or cleaning grout around your bathroom, but they're pretty pricey. Luckily, you can make your own with just three simple ingredients.

One Good Thing by Jillee has the unbelievably simple recipe. All you'll need is a little bleach, a few Tablespoons of cornstarch, and water. The resulting gel is just like what you'd get from the store, but for a tiny fraction of the price. Once you're done creating the gel, you can store it in a squeeze bottle for easy and precise application on your clothes or around the house.